US20040000400A1 - Assessing downhole WBM-contaminated connate water - Google Patents
Assessing downhole WBM-contaminated connate water Download PDFInfo
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- US20040000400A1 US20040000400A1 US10/318,800 US31880002A US2004000400A1 US 20040000400 A1 US20040000400 A1 US 20040000400A1 US 31880002 A US31880002 A US 31880002A US 2004000400 A1 US2004000400 A1 US 2004000400A1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000000706 filtrate Substances 0.000 claims abstract description 46
- 239000012530 fluid Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000005284 excitation Effects 0.000 claims abstract description 25
- 238000011010 flushing procedure Methods 0.000 claims abstract description 16
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 7
- 239000007850 fluorescent dye Substances 0.000 claims abstract description 4
- 239000003129 oil well Substances 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 6
- 238000011109 contamination Methods 0.000 abstract description 17
- 238000004458 analytical method Methods 0.000 abstract description 10
- 238000010200 validation analysis Methods 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 45
- 230000015572 biosynthetic process Effects 0.000 description 13
- 239000000975 dye Substances 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000001917 fluorescence detection Methods 0.000 description 2
- 238000002189 fluorescence spectrum Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- NJDNXYGOVLYJHP-UHFFFAOYSA-L disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C1=C2C=CC(=O)C=C2OC2=CC([O-])=CC=C21 NJDNXYGOVLYJHP-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- GNBHRKFJIUUOQI-UHFFFAOYSA-N fluorescein Chemical group O1C(=O)C2=CC=CC=C2C21C1=CC=C(O)C=C1OC1=CC(O)=CC=C21 GNBHRKFJIUUOQI-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/241—Earth materials for hydrocarbon content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
- G01N33/2882—Markers
Definitions
- the invention is directed to evaluating new petroleum discoveries by analysis of fluid samples acquired by wireline fluid sampling (WFS) from an oilfield reservoir.
- WFS wireline fluid sampling
- the invention is directed to a method and apparatus for measuring downhole water-based mud (WBM) filtrate concentration in a sample of connate water before the sample is brought to the surface.
- WBM downhole water-based mud
- the invention provides a method and apparatus for assessing water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well.
- the invention provides a method for measuring water-based mud filtrate concentration.
- the method includes pumping a water-based mud having a water-soluble fluorescent dye tracer into the borehole; pumping sample fluid from a selected downhole location through a downhole flow line; illuminating sample fluid in an excitation region of the downhole flow line with fluorescence excitation light; and measuring fluorescence emission from the excitation region to produce a measured value representing the fraction of water-based mud filtrate in the sample fluid.
- the invention provides a tool including an elongated body containing a flow line having a window, the flow line containing an excitation region proximate to the window; and a pump configured to pump sample fluid from a selected downhole location through the flow line.
- the invention further provides a method for establishing a calibration value representing 100% water-based mud filtrate.
- the calibration value is established by pumping substantially 100% water-based mud filtrate through the downhole flow line and measuring fluorescence emission from the excitation region.
- the calibration value is established by measuring fluorescence emission in a laboratory.
- the invention further provides a method and apparatus for validating a sample of connate water as having an acceptably low WBM filtrate contamination.
- Each sample is drawn from formation at a selected depth and tested for validation downhole, in real time.
- Each measured value of the series of measured values is compared with a predetermined fraction of a calibration value. Samples that are validated may be captured and brought to the surface for analysis.
- the invention further provides a method and apparatus for using the time series data and a predetermined fraction of the calibration value to calculate a predicted flushing time to completion.
- FIG. 1 is a flowchart of a first preferred embodiment of a method for measuring downhole, in real time, water-based mud (WBM) filtrate concentration in a sample of connate water drawn from formation surrounding a well.
- WBM water-based mud
- FIG. 2 is a flowchart of a first preferred embodiment of a method for calibrating the fluorescence monitor in situ.
- FIG. 3 is a flowchart of a method for validating downhole, in real time, a sample of connate water as having an acceptably low WBM filtrate contamination.
- FIG. 4 is a flowchart of a method for predicting flushing time needed at a current vertical location of the tool to produce a sample having an acceptably low WBM filtrate contamination.
- FIG. 5 is a schematic diagram of a wireline tool including a fluorescence monitor according to the invention.
- FIG. 6 is a schematic diagram locating several modules of the wireline tool of FIG. 5, and showing the fluorescence monitor in the fluid analysis module.
- FIG. 7 is a schematic illustration of a first preferred embodiment of a fluorescence monitor according to the invention.
- FIG. 8 is an image of a dual packer module used in the first preferred embodiment of a tool according to the invention.
- FIG. 9 shows an embodiment of a wireline tool according to the invention having a sample probe, in a schematic illustration of the spherical flow model used in analysis of the operation of the invention.
- FIG. 10 is a graph showing fluorescence spectra measured using a laboratory spectrometer.
- FIG. 11 is a graph showing integrated fluorescence signal for the preferred embodiment of the invention.
- the invention provides a method, illustrated in FIG. 1, for measuring downhole, in real time, water-based mud (WBM) filtrate concentration in a sample of connate water drawn from formation surrounding a well.
- WBM water-based mud
- the method includes stimulating fluorescence in a tracer dye in the WBM and measuring fluorescence emission.
- the fluorescence monitor is calibrated in situ by the method illustrated in FIG. 2.
- the fluorescence monitor may be calibrated in the laboratory prior to operation in a borehole based on data provided in the graphs of FIGS. 10 and 11.
- FIGS. 10 and 11 show an example of calibration that involves seven calibration fluids: 1 ppm (100% mud), 0.5 ppm (50% mud), 0.4 ppm (40% mud), 0.3 ppm (30% mud), 0.2 ppm (20% mud), 0.1 ppm (10% mud), and water (0% mud).
- FIG. 10 is a graph showing fluorescence spectra measured using a laboratory spectrometer.
- FIG. 11 shows that intensity of fluorescence is almost proportional to dye concentration, and therefore WBM contaimaination level. However, this relationship does not hold when the dye concentration is high. At high concentrations, saturation limits fluorescence intensity so sensitivity is reduced. For this reason, it is important to select an appropriate dye concentration to use. To avoid saturation effects, dye concentration must not be too high.
- the invention also provides a method, illustrated in FIG. 3, for validating a sample of connate water as having an acceptably low WBM filtrate contamination.
- Each sample is drawn from formation at a selected depth and tested for validation downhole, in real time. Samples that are validated may be captured and brought to the surface for analysis. Samples that are not validated are typically discarded immediately.
- the method includes comparing measured fluorescence emission to a reference fluorescence emission. This method minimizes unnecessary time spent in flushing by capturing a sample as soon as the flushing process has produced a sample having an acceptably low WBM filtrate contamination.
- the invention also provides a method, illustrated in FIG. 4, for predicting flushing time needed at a current vertical location of the tool to produce a sample having an acceptably low WBM filtrate contamination.
- the process of flushing is illustrated in FIG. 9 with a probe embodiment.
- Formation fluid flow 92 in this case connate water
- FIG. 9 shows borehole surface region 91 as formation permeated by mud filtrate (in this case WBM with tracer dye.
- FIG. 9 shows borehole surface region 91 extending as a cylinder surrounding the borehole and the tool. “Flushing time to completion” is the time needed to produce a sample having an acceptably low WBM filtrate contamination.
- the method includes measuring fluorescence emission at successive times and monitoring rate of decrease of measured emission to produce a predicted flushing time.
- Knowledge of the predicted flushing time enables the tool operator to identify a location where flushing to produce a sample having an acceptably low WBM filtrate contamination would take an unreasonable time. On identifying such a location, the tool operator would typically abandon the current vertical location and move the tool to a next available vertical location.
- the tracer dye is Uranine (Fluorescein disodium salt).
- the dye is dissolved in water based mud (WBM) with a concentration of typically 1 ppm in weight.
- WBM water based mud
- the concentration may be in the range from 0.1 ppm to 10 ppm.
- a concentration will be selected depending on the geometry and sensitivity of a particular fluorescence monitor.
- FIG. 5 is a schematic diagram of a wireline operation including tool 20 and fluorescence monitor 40 according to the invention.
- Tool 20 having elongated body 21 , is suspended in borehole 12 from the lower end of a logging cable 22 that is connected in a conventional fashion to a surface system 16 incorporating appropriate electronics and processing systems for control of the tool.
- Fluorescence monitor 40 is included within tool body 21 .
- FIG. 6 is a schematic diagram of wireline tool 20 .
- Elongated body 21 includes pump out module 23 , sample chambers module 24 , fluorescence module 26 , and dual packer module 27 .
- Fluorescence module 26 contains fluorescence monitor 40 .
- Dual packer module 27 is equipped for selectively sealing off or isolating portions of the wall of the borehole between upper packer 28 and lower packer 29 , such that pressure or fluid communication with the adjacent earth formation is established.
- FIG. 8 is an image of dual packer module 27 .
- Elongated body 21 defines flow line 31 and fluid admitting aperture 32 . Formation fluid inflow is indicated by arrow 33 . Elongated body 21 also includes piston pump 34 and defines fluid exit aperture 35 . Formation fluid outflow back into the borehole is indicated by arrow 36 . Piston pump 34 provides the pressure to drive fluid sample through the flow line and though the sample cell. Tool 20 also includes sample chambers 37 for capturing and carrying fluid samples to the surface for analysis.
- FIG. 7 shows detail of preferred optics of fluorescence monitor 40 .
- the preferred embodiment includes a portion of flow line 31 having a sapphire optical window 41 .
- Flow line 31 and excitation light source 51 define fluid sample excitation region 42 .
- Fluorescence monitor 40 includes the sapphire optical window 41 , excitation light source (490 nm) 51 , first fluorescence detector (540 nm) 61 , second fluorescence detector (600 nm) 71 .
- Excitation light source 51 includes light-emitting diode (LED) 52 (shown emitting fluorescence excitation, 490 nm, light rays 53 ), converging lens 54 , short-pass optical filter ( ⁇ 490 nm), and glass rod light pipe 56 .
- LED light-emitting diode
- First fluorescence detector (540 nm) 61 includes glass conduit light pipe 62 and long-pass optical filter (>540 nm) 63 (shown passing fluorescence emission rays (540 nm) 64 ), converging lens 65 , and first fluorescence sensor (540 nm) 66 .
- Second fluorescence detector (600 nm) 71 includes glass conduit light pipe 72 and long-pass optical filter (>600 nm) 73 (shown passing fluorescence emission rays (600 nm) 74 ), converging lens 75 , and first fluorescence sensor (600 nm) 76 .
- Fluorescence monitor 40 also includes data base means, and a processing means (not shown).
- Fluids drawn from the formation into fluid sample excitation region 42 are illuminated by excitation light. Emitted fluorescent light is detected to produce fluorescence intensity and other signals. The signals are processed, based on information in the data base relating to the different types of light, to measure fluorescence emission and to determine sample validity or to predict flushing time.
- the excitation wavelength is preferably 490 nm
- the fluorescence detection wavelengths are preferably 540 nm and 600 nm.
- Pressure to draw the sample is provided by a piston pump 34 of FIG. 6. Measurements are made of fluorescence from a flowing sample in an excitation region 42 of flow line 31 , as shown in FIG. 7.
- FIG. 9 shows a schematic illustration of the spherical flow model used in analysis of the operation of the invention.
- the wireline tool shown in FIG. 9 includes a sample probe 95 . This is an alternative to the preferred dual packer embodiment.
Abstract
Water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well is assessed. To measure water-based mud filtrate concentration, a water-based mud having a water-soluble fluorescent dye tracer is pumped into the borehole; sample fluid from a selected downhole location is pumped through a downhole flow line having a window; sample fluid flowing in an excitation region of the downhole flow line is illuminated through the window with fluorescence excitation light; and fluorescence emission from the excitation region is measured to produce a measured value. The measured value represents the fraction of water-based mud filtrate in the sample fluid. A calibration value is determined representing 100% water-based mud filtrate. A method for validating a sample of connate water as having an acceptably low WBM filtrate contamination tests for validation downhole, in real time. Each measured value of the series of measured values is compared with a predetermined fraction of a calibration value. Samples that are validated may be captured and brought to the surface for analysis. A method using the time series data and a predetermined fraction of the calibration value calculates a predicted flushing time to completion.
Description
- This application claims priority to co-owned, co-pending U.S. provisional application no. 60/391,570, filed Jun. 26, 2002, entitled “Fluorescence Detection of Dew-Induced Liquid Films from Retrograde Condensates” and to co-owned, co-pending U.S. application Ser. No. 10/305,878 filed Nov. 28, 2002, entitled “Method for Validating a Downhole Connate Water Sample”, which claimed priority to U.S. provisional application No. 60/333,890, filed Nov. 28, 2001, also entitled “Method for Validating a Downhole Connate Water Sample”.
- The invention is directed to evaluating new petroleum discoveries by analysis of fluid samples acquired by wireline fluid sampling (WFS) from an oilfield reservoir. In particular, the invention is directed to a method and apparatus for measuring downhole water-based mud (WBM) filtrate concentration in a sample of connate water before the sample is brought to the surface.
- In evaluating a new petroleum discovery, formation fluid samples are acquired for analysis. Such samples are typically acquired by open-hole wireline fluid sampling (WFS) and brought to the surface for analysis. Accordingly, as currently practiced, mud filtrate contamination of a sample is typically not measured until after the sample is brought to the surface. If excessive mud filtrate contamination is detected after the sample is brought to the surface, the sample is deemed invalid and is discarded. Even if the sample is suitable for use, time has usually been wasted in extra flushing of the sampling tool when an earlier sample would have been good enough.
- There are four situations involving oil based mud (OBM) filtrate or water based mud (WBM) filtrate contamination of formation fluid samples. These are OBM filtrate contamination of oil samples; WBM filtrate contamination of oil samples; OBM filtrate contamination of connate water samples; and WBM filtrate contamination of connate water samples. The last situation, WBM filtrate contamination of connate water samples, is not addressed in the prior art. Thus, there is an unfulfilled need for a method and apparatus for measuring downhole water-based mud (WBM) filtrate concentration in a sample of connate water before the sample is brought to the surface.
- The invention provides a method and apparatus for assessing water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well.
- The invention provides a method for measuring water-based mud filtrate concentration. The method includes pumping a water-based mud having a water-soluble fluorescent dye tracer into the borehole; pumping sample fluid from a selected downhole location through a downhole flow line; illuminating sample fluid in an excitation region of the downhole flow line with fluorescence excitation light; and measuring fluorescence emission from the excitation region to produce a measured value representing the fraction of water-based mud filtrate in the sample fluid.
- The invention provides a tool including an elongated body containing a flow line having a window, the flow line containing an excitation region proximate to the window; and a pump configured to pump sample fluid from a selected downhole location through the flow line.
- The invention further provides a method for establishing a calibration value representing 100% water-based mud filtrate. In a preferred embodiment, the calibration value is established by pumping substantially 100% water-based mud filtrate through the downhole flow line and measuring fluorescence emission from the excitation region. In another embodiment, the calibration value is established by measuring fluorescence emission in a laboratory.
- The invention further provides a method and apparatus for validating a sample of connate water as having an acceptably low WBM filtrate contamination. Each sample is drawn from formation at a selected depth and tested for validation downhole, in real time. Each measured value of the series of measured values is compared with a predetermined fraction of a calibration value. Samples that are validated may be captured and brought to the surface for analysis.
- The invention further provides a method and apparatus for using the time series data and a predetermined fraction of the calibration value to calculate a predicted flushing time to completion.
- FIG. 1 is a flowchart of a first preferred embodiment of a method for measuring downhole, in real time, water-based mud (WBM) filtrate concentration in a sample of connate water drawn from formation surrounding a well.
- FIG. 2 is a flowchart of a first preferred embodiment of a method for calibrating the fluorescence monitor in situ.
- FIG. 3 is a flowchart of a method for validating downhole, in real time, a sample of connate water as having an acceptably low WBM filtrate contamination.
- FIG. 4 is a flowchart of a method for predicting flushing time needed at a current vertical location of the tool to produce a sample having an acceptably low WBM filtrate contamination.
- FIG. 5 is a schematic diagram of a wireline tool including a fluorescence monitor according to the invention.
- FIG. 6 is a schematic diagram locating several modules of the wireline tool of FIG. 5, and showing the fluorescence monitor in the fluid analysis module.
- FIG. 7 is a schematic illustration of a first preferred embodiment of a fluorescence monitor according to the invention.
- FIG. 8 is an image of a dual packer module used in the first preferred embodiment of a tool according to the invention.
- FIG. 9 shows an embodiment of a wireline tool according to the invention having a sample probe, in a schematic illustration of the spherical flow model used in analysis of the operation of the invention.
- FIG. 10 is a graph showing fluorescence spectra measured using a laboratory spectrometer.
- FIG. 11 is a graph showing integrated fluorescence signal for the preferred embodiment of the invention.
- The invention provides a method, illustrated in FIG. 1, for measuring downhole, in real time, water-based mud (WBM) filtrate concentration in a sample of connate water drawn from formation surrounding a well. The method includes stimulating fluorescence in a tracer dye in the WBM and measuring fluorescence emission.
- Preferably, the fluorescence monitor is calibrated in situ by the method illustrated in FIG. 2.
- Alternatively, the fluorescence monitor may be calibrated in the laboratory prior to operation in a borehole based on data provided in the graphs of FIGS. 10 and 11. FIGS. 10 and 11 show an example of calibration that involves seven calibration fluids: 1 ppm (100% mud), 0.5 ppm (50% mud), 0.4 ppm (40% mud), 0.3 ppm (30% mud), 0.2 ppm (20% mud), 0.1 ppm (10% mud), and water (0% mud). FIG. 10 is a graph showing fluorescence spectra measured using a laboratory spectrometer. FIG. 11 shows that intensity of fluorescence is almost proportional to dye concentration, and therefore WBM contaimaination level. However, this relationship does not hold when the dye concentration is high. At high concentrations, saturation limits fluorescence intensity so sensitivity is reduced. For this reason, it is important to select an appropriate dye concentration to use. To avoid saturation effects, dye concentration must not be too high.
- The invention also provides a method, illustrated in FIG. 3, for validating a sample of connate water as having an acceptably low WBM filtrate contamination. Each sample is drawn from formation at a selected depth and tested for validation downhole, in real time. Samples that are validated may be captured and brought to the surface for analysis. Samples that are not validated are typically discarded immediately. The method includes comparing measured fluorescence emission to a reference fluorescence emission. This method minimizes unnecessary time spent in flushing by capturing a sample as soon as the flushing process has produced a sample having an acceptably low WBM filtrate contamination.
- The invention also provides a method, illustrated in FIG. 4, for predicting flushing time needed at a current vertical location of the tool to produce a sample having an acceptably low WBM filtrate contamination. The process of flushing is illustrated in FIG. 9 with a probe embodiment. Formation fluid flow92 (in this case connate water) is drawn towards the aperture of
probe 95 and flushes away mud filtrate from a local region of the formation. FIG. 9 showsborehole surface region 91 as formation permeated by mud filtrate (in this case WBM with tracer dye. FIG. 9 showsborehole surface region 91 extending as a cylinder surrounding the borehole and the tool. “Flushing time to completion” is the time needed to produce a sample having an acceptably low WBM filtrate contamination. The method includes measuring fluorescence emission at successive times and monitoring rate of decrease of measured emission to produce a predicted flushing time. Knowledge of the predicted flushing time enables the tool operator to identify a location where flushing to produce a sample having an acceptably low WBM filtrate contamination would take an unreasonable time. On identifying such a location, the tool operator would typically abandon the current vertical location and move the tool to a next available vertical location. - Preferably, the tracer dye is Uranine (Fluorescein disodium salt). The dye is dissolved in water based mud (WBM) with a concentration of typically 1 ppm in weight. The concentration may be in the range from 0.1 ppm to 10 ppm. A concentration will be selected depending on the geometry and sensitivity of a particular fluorescence monitor.
- FIG. 5 is a schematic diagram of a wireline
operation including tool 20 and fluorescence monitor 40 according to the invention.Tool 20, having elongatedbody 21, is suspended inborehole 12 from the lower end of alogging cable 22 that is connected in a conventional fashion to asurface system 16 incorporating appropriate electronics and processing systems for control of the tool. Fluorescence monitor 40 is included withintool body 21. - FIG. 6 is a schematic diagram of
wireline tool 20.Elongated body 21 includes pump outmodule 23,sample chambers module 24,fluorescence module 26, anddual packer module 27. (Other prior art modules, including power cartridge, hydraulic module, and flow control module that are normally present are not shown in FIG. 6).Fluorescence module 26 containsfluorescence monitor 40.Dual packer module 27 is equipped for selectively sealing off or isolating portions of the wall of the borehole betweenupper packer 28 andlower packer 29, such that pressure or fluid communication with the adjacent earth formation is established. FIG. 8 is an image ofdual packer module 27. -
Elongated body 21 definesflow line 31 andfluid admitting aperture 32. Formation fluid inflow is indicated byarrow 33.Elongated body 21 also includespiston pump 34 and definesfluid exit aperture 35. Formation fluid outflow back into the borehole is indicated byarrow 36.Piston pump 34 provides the pressure to drive fluid sample through the flow line and though the sample cell.Tool 20 also includessample chambers 37 for capturing and carrying fluid samples to the surface for analysis. - A description of a wireline tool such as shown in FIG. 6, but without the fluorescence monitor of the present invention, is found in U.S. Pat. No. 4,860,581, issued Aug. 29, 1989, to Zimmerman et al. A copy of U.S. Pat. No. 4,860,581 is hereby incorporated herein by reference.
- FIG. 7 shows detail of preferred optics of
fluorescence monitor 40. The preferred embodiment includes a portion offlow line 31 having a sapphireoptical window 41.Flow line 31 andexcitation light source 51 define fluidsample excitation region 42. Fluorescence monitor 40 includes the sapphireoptical window 41, excitation light source (490 nm) 51, first fluorescence detector (540 nm) 61, second fluorescence detector (600 nm) 71.Excitation light source 51 includes light-emitting diode (LED) 52 (shown emitting fluorescence excitation, 490 nm, light rays 53), converginglens 54, short-pass optical filter (<490 nm), and glass rodlight pipe 56. First fluorescence detector (540 nm) 61 includes glass conduitlight pipe 62 and long-pass optical filter (>540 nm) 63 (shown passing fluorescence emission rays (540 nm) 64), converginglens 65, and first fluorescence sensor (540 nm) 66. Second fluorescence detector (600 nm) 71 includes glass conduitlight pipe 72 and long-pass optical filter (>600 nm) 73 (shown passing fluorescence emission rays (600 nm) 74), converginglens 75, and first fluorescence sensor (600 nm) 76. Fluorescence monitor 40 also includes data base means, and a processing means (not shown). - Fluids drawn from the formation into fluid
sample excitation region 42 are illuminated by excitation light. Emitted fluorescent light is detected to produce fluorescence intensity and other signals. The signals are processed, based on information in the data base relating to the different types of light, to measure fluorescence emission and to determine sample validity or to predict flushing time. The excitation wavelength is preferably 490 nm The fluorescence detection wavelengths are preferably 540 nm and 600 nm. Pressure to draw the sample is provided by apiston pump 34 of FIG. 6. Measurements are made of fluorescence from a flowing sample in anexcitation region 42 offlow line 31, as shown in FIG. 7. - FIG. 9 shows a schematic illustration of the spherical flow model used in analysis of the operation of the invention. The wireline tool shown in FIG. 9 includes a
sample probe 95. This is an alternative to the preferred dual packer embodiment.
Claims (11)
1. A method for assessing water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well, comprising:
a) pumping a water-based mud having a water-soluble fluorescent dye tracer into the borehole;
b) pumping sample fluid from a selected downhole location through a downhole flow line;
c) illuminating sample fluid in an excitation region of the downhole flow line with fluorescence excitation light; and
d) measuring fluorescence emission from the excitation region to produce a measured value representing the fraction of water-based mud filtrate in the sample fluid.
2. A method according to claim 1 , further comprising:
e) establishing a calibration value representing 100% water-based mud filtrate.
3. A method according to claim 2 , wherein the calibration value is established by pumping substantially 100% water-based mud filtrate through the downhole flow line and measuring fluorescence emission from the excitation region.
4. A method according to claim 2 , wherein the calibration value is established by measuring fluorescence emission in a laboratory.
5. A method according to claim 2 , further comprising:
f) repeating b), c), and d) to produce a series of measured values representing the fraction of water-based mud filtrate in each of a series of downhole fluid samples;
g) comparing each measured value of the series of measured values with a predetermined fraction of the calibration value; and
h) validating a downhole fluid sample as having an acceptably low fraction of water-based mud filtrate when the measured value of the sample is less than the predetermined fraction of the calibration value.
6. A method according to claim 2 , further comprising:
i) repeating b), c), and d) at intervals of time to produce time series data including a series of times, and a corresponding series of measured values representing the fraction of water-based mud filtrate in each of a series of downhole fluid samples; and
j) using the time series data and a predetermined fraction of the calibration value to calculate a predicted flushing time to completion.
7. A method according to claim 6 , further comprising:
k) comparing calculated flushing time to completion with a predetermined acceptable time to completion.
8. A tool for assessing water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well containing water-based mud with a water-soluble fluorescent dye tracer, comprising:
an elongated body containing a flow line having a window, the flow line containing an excitation region proximate to the window;
a pump configured to pump sample fluid from a selected downhole location through the flow line;
means for illuminating sample fluid in the excitation region with fluorescence excitation light; and
means for measuring fluorescence emission from the excitation region and producing a measured value representing the fraction of water-based mud filtrate in the sample fluid.
9. A tool according to claim 8 , further comprising:
means for establishing a calibration value representing 100% water-based mud filtrate.
10. A tool according to claim 8 , further comprising:
means for producing a series of measured values representing the fraction of water-based mud filtrate in each of a series of downhole fluid samples;
means for comparing each measured value of the series of measured values with a predetermined fraction of a calibration value; and
means for validating a downhole fluid sample as having an acceptably low fraction of water-based mud filtrate when the measured value of the sample is less than the predetermined fraction of the calibration value.
11. A tool according to claim 8 , further comprising:
means for producing a series of measured values at intervals of time to produce time series data including a series of times, and a corresponding series of measured values representing the fraction of water-based mud filtrate in each of a series of downhole fluid samples; and
means for using the time series data and a predetermined fraction of a calibration value to calculate a predicted flushing time to completion.
Priority Applications (3)
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US10/318,800 US7028773B2 (en) | 2001-11-28 | 2002-12-13 | Assessing downhole WBM-contaminated connate water |
GB0327277A GB2396412B (en) | 2002-11-27 | 2003-11-25 | Assessing downhole wbm-contaminated connate water |
NO20035280A NO333596B1 (en) | 2002-11-27 | 2003-11-27 | Method and apparatus for assessing water-based drilling mud filtrate concentration in a downhole liquid sample |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US33389001P | 2001-11-28 | 2001-11-28 | |
US39157002P | 2002-06-26 | 2002-06-26 | |
US10/305,878 US6729400B2 (en) | 2001-11-28 | 2002-11-27 | Method for validating a downhole connate water sample |
US10/318,800 US7028773B2 (en) | 2001-11-28 | 2002-12-13 | Assessing downhole WBM-contaminated connate water |
Related Parent Applications (1)
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US10/305,878 Continuation-In-Part US6729400B2 (en) | 2001-11-28 | 2002-11-27 | Method for validating a downhole connate water sample |
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US7028773B2 US7028773B2 (en) | 2006-04-18 |
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US (1) | US7028773B2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
NO333596B1 (en) | 2013-07-15 |
GB2396412A (en) | 2004-06-23 |
NO20035280D0 (en) | 2003-11-27 |
US7028773B2 (en) | 2006-04-18 |
GB2396412B (en) | 2005-12-14 |
GB0327277D0 (en) | 2003-12-24 |
NO20035280L (en) | 2004-05-28 |
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